GridColumnSummary.DisplayFormat Property

Gets or sets the pattern used to format the summary value. This is a bindable property.

Namespace: DevExpress.Maui.DataGrid

Assembly: DevExpress.Maui.DataGrid.dll

NuGet Package: DevExpress.Maui.DataGrid

Declaration

public string DisplayFormat { get; set; }

Property Value

Type	Description
String	A string that specifies the pattern used to format the summary value.

Remarks

Use the DisplayFormat property to format the summary value and accompany it with additional text. A pattern should have the following structure:

<custom static text>{0:<format specifier<precision specifier>>}<custom static text>

• {0}—the summary value’s placeholder.
• format specifier—the format type (currency, scientific, etc).
• precision specifier—the number of characters displayed after the decimal point.

For example, to display currency values, set the DisplayFormat property to ‘Total: {0:c2}‘. If the summary value is 123, its formatted equivalent is Total: $123.00.

If you do not specify the summary’s display format, the grid uses the following default formats:

Summary Type	Total Summary Format	Group Summary Format
Average	AVG={0:columnDisplayFormat}	summaryFieldName: AVG={0:columnDisplayFormat}
Count	{0}	{0}
Min	MIN={0:columnDisplayFormat}	summaryFieldName: MIN={0:columnDisplayFormat}
Max	MAX={0:columnDisplayFormat}	summaryFieldName: MAX={0:columnDisplayFormat}
Sum	SUM={0:columnDisplayFormat}	summaryFieldName: SUM={0:columnDisplayFormat}

Example

The following example uses predefined aggregate functions (Max and Sum) and a custom rule to calculate group and total summaries for a grid that displays orders grouped by dates.

Set up the following summaries:

• A group summary to display the maximum Total value for each group of orders.
• A total summary to calculate the sum of values in the Total column.
• A custom total summary to count the number of orders with the false value in the Shipped column.

XAML

<dxg:DataGridView x:Name="grid" ItemsSource="{Binding Orders}" 
                  CustomSummary="grid_CalculateCustomSummary">
    <!-- ... -->
    <dxg:DataGridView.GroupSummaries>
        <dxg:GridColumnSummary FieldName="Total" Type="Max"/>
    </dxg:DataGridView.GroupSummaries>

    <dxg:DataGridView.TotalSummaries>
        <dxg:GridColumnSummary FieldName="Total" Type="Sum" 
                               DisplayFormat="Total: {0:C0}"/>
        <dxg:GridColumnSummary FieldName="Shipped" Type="Custom" 
                               DisplayFormat="Not Shipped: {0}"/>
    </dxg:DataGridView.TotalSummaries>
</dxg:DataGridView>

C#

int count;
// ...

void grid_CalculateCustomSummary(object sender, DevExpress.Data.CustomSummaryEventArgs e) {
    if (e.FieldName.ToString () == "Shipped")
        if (e.IsTotalSummary){
            if (e.SummaryProcess == CustomSummaryProcess.Start) {
                count = 0;
            }
            if (e.SummaryProcess == CustomSummaryProcess.Calculate) {
                if (!(bool)e.FieldValue)
                    count++;
                e.TotalValue = count;
            }
        }
}